Centrifugal separator provided with special discharges



Aug '29, 1939 N. E. BERGNER 2,171,136 CENTRIFUGAL SEPARATOR PROVIDEDWITH SPECIAL DISCHARGES l ,Filed July 24, 19:55

WIT/V555.'

Afro/Mins Patented Aug. 29, 1939 UNITED STATES PATENT OFFICE CENTRIUGALSEPARATOR PROVIDED WITH SPECIAL DISCHARGES Application July 24, 1935,serial No. 32,826 In Sweden September 1, 1934 1 Claim.

In order to take out from a centrifugal bowl a separated ingredient,such as` skim milk from a cream separator, it is known to use a paringor skimming device comprising a tube-like element 5 with its inletopening in a direction approximately opposite to that of the rotation ofthe bowl and extending inward to a discharge conduit at or near the axisof rotation of ythe bowl. Part of the kinetic energy of the liquid isthereby transformed into pressure, which is transmitted to the pipeline. With such paring devices it has been difcult, without the use ofcomplicated tightening devices, to obtain milk without foam.Substantially better results are obtained by making the paring device ofa disc-shape, usually in the form of upper and lower discs between whichare positioned curved wings providing a series of curved channels whoseinlets ex-tend around the periphery of the paring device. When treatingliquids that are easily contaminated, the paring device must be readilyaccessible for cleaning. .My improvement comprises a disc paring deviceof the character specified made of separable parts adapted to be heldtightly together and capable of easy assemblage and disassemblage. Apreferred embodiment of the invention is shown in the accompanyingdrawing, in which- Fig. 1 is a vertical sectional view of the upper partof a centrifugal separator embodying the invention.

Fig. 2 is a horizontal section on the line 2--2 of Fig. 1.

The paring device a is positioned in a bowl chamber b, which may be theseparating space of the bowl, but which will usually be a specialchamber into which one of the separated ingredients (e. g., skim milk)is discharged from the separating space of the bowl through channels notshown. The paring device comprises a lower part 3 provided with wings Acovered by an upper part 5.

The lower part 3 is secured to or (preferably) integral with an uppercentral extension tube 8 and a lower central extension tube I0. Aroundtube 8 extends a casing 5 (enclosing a chamber I) having a dependingannular flange 6G within which extends an upstanding annular extensionof the upper par-t 5 of the parer. The channels 40 formed between thewings 4 continue up within the extension 50 and open into the chamber 1.

50 The upper part of the extension tube 8 is threaded to receive a nutI2, which may carry a liquid feed funnel II, from which liquid to beseparated may be fed through tube 8, I 0 to the separating space of thebowl. Between the nut I2 and the topi wall of casing 6 may be. placed apacking I3, which prevents liquid from. leaking out of the system.Packing between the chamber 5 'I and the feed funnel II may be dispensedwith if the pressure in chamber 'l is maintained higher than that in thefunnel I I, since any liquid leaking from` chamber 1 into the funnel I Iis fed again to the separator. If', however, a lower pressure prel0vails in the chamber 'I than in funnel II, sealing is required toprevent leakage.

To avoid the use of sealing means between casing 6 and the upper part ofthe paring disc, the annular flange of the casing 6 extends down l5through the top wall of the chamber b' and contacts with, and engages ashoulder on, the upwardly extending member 5I) of the part 5 of theparing device, whereby all liquid leaking out of chamber 1 is carriedinto chamber b` and thence 20 back into the paring device.

After removal of the cover plate I5 of the bowl chamber and theunscrewing of the funnel Il from the feed tube, the latter, and with itthe paring device and the casing B may be lifted out 25 and theseparable parts thereof readily cleaned.

What I claim and desire to protect by Letters Patent is:

In a centrifugal separator, the combination with a revoluble bowlchamber, of a non-revolublc 30 central feed tube extending therethrough,a paring device comprising a lower paring disc member in tight relationwith the feed tube and a separate upper paring disc member having anexterior annular shoulder, the bowl chamber en- 35 closing the paringdevice, a separate casing enclosing a receiving chamber above the bowlchamber, there being a liquid outflow passage between the discs of theparing device communicating with the receiving chamber, the inner wallof said out- 40 iiow passage being formed by the feed tube, said casinghaving a depending annular flange extending toward and into the bowlchamber and engaging the shoulder on the outside of the upper paringdisc member, and means to clamp the 45 upper paring disc member betweenthe flange of the casing and `the lowery paring disc member, whereby theparts may be readily assembled and disassembled and any leakage from thereceiving chamber will be carried inside said flange into the 50 bowlchamber.

N OREI EINAR BERGNER.

